One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(7,8)(10,12)(13,14,19,16)(15,23,25,20)(17,21,24,26)(18,22,28,27)(1,2)(3,4)(5,6)(7,12)(8,10)(9,11)(13,15,19,25)(14,20,16,23)(17,18,24,28)(21,27,26,22)(5,7,9,8)(6,10,11,12)(13,16,19,14)(15,20,25,23)(17,26,24,21)(18,27,28,22)(5,6)(7,12)(8,10)(9,11) involution — undirected(5,8,9,7)(6,10,11,12)(13,17)(14,21)(15,18)(16,26)(19,24)(20,27)(22,23)(25,28)(5,6)(7,10)(8,12)(9,11)(13,18)(14,22)(15,24)(16,27)(17,25)(19,28)(20,21)(23,26) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.